Eql Update from 7.1.5 to 8.x

Hi all,

I'm planning a upgrade of a SAN-group with mixed PS4100/PS6100 AND Active syncrep for an ESXi 5.1 environment.
The last time the customer did an upgrade form the group they experienced problems with the syncrep which failed during the upgrades

Can I expect problems with syncrep when i perform the upgrade from 7.1.5 to8.1.x. ?
According the readme's it is a direct upgrade and both of the version are able to replicate to each other. 

The Upgrade of ESX 5.1 to 6 will be planned in the near future but first we have to upgrade the SAN environment.

Regards

Rob  Coenders